Add return-by-value implementations of blink::WebMediaPlayer::buffered()

media/base/pipeline.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 146 matching lines @@
   // Attempt to set the volume of the audio renderer.  Valid values for volume
   // range from 0.0f (muted) to 1.0f (full volume).  This value affects all
   // channels proportionately for multi-channel audio streams.
   void SetVolume(float volume);
 
   // Returns the current media playback time, which progresses from 0 until
   // GetMediaDuration().
   base::TimeDelta GetMediaTime() const;
 
   // Get approximate time ranges of buffered media.
-  Ranges<base::TimeDelta> GetBufferedTimeRanges();
+  Ranges<base::TimeDelta> GetBufferedTimeRanges() const;
 
   // Get the duration of the media in microseconds.  If the duration has not
   // been determined yet, then returns 0.
   base::TimeDelta GetMediaDuration() const;
 
   // Return true if loading progress has been made since the last time this
   // method was called.
   bool DidLoadingProgress();
 
   // Gets the current pipeline statistics.
@@ skipping 246 matching lines @@
   scoped_ptr<SerialRunner> pending_callbacks_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(Pipeline);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_